Review Topics for Success

Learning Outcomes

  • Solve proportional equations
  • Use the square root property to solve a quadratic equation
  • Solve a radical equation by isolating the radical term and then raising both sides to a power to remove the radical
  • Identify a radical equation with no solution or extraneous solutions

In Module 2 you learned the formula for finding the sample standard deviation:

[latex]\LARGE s= \sqrt{ \frac{ \sum(x-\overline{x} )^2}{n-1}}[/latex]

To find this, you needed to know the data values (x) and the sample size (n). But sometimes we may need to write an equation like this in a different form. What if you need to solve for n? To do this, you need to know how to remove the radical and what to do with an equation that contains a variable in a denominator. In this review section we’ll discuss some equation solving techniques.

Recall for success

Look for red boxes like this one throughout the text. They’ll show up just in time to give helpful reminders of the math you’ll need, right where you’ll need it.